so i have had my fish in my 3.5 gallon tank for about 2 months now (sence easter). i 3 tetras, 2 zebra danios, 2 red phantom tetras, and 1 small catfish
so my one tetra is bobbing up and down but is living.. he will atempt to eat but he cant stay boyunt long enough. all of the other fish are thriving, its just him any advise will do...

i have 9 bettas together, i dog named sunny, a few tetras, and a pond out my back door

First off that aquarium is extremely overstocked, what you have should be in at least a 10g.

It may be caused by stress, swim bladder problems. Do you have any petsmarts, petco's, or good fish stores that will test your water for you? Neons like soft water so if your waters really hard it will make them unhealthy.

That is a grossly overstocked tank. Those fish need at least a 10 gal tank, and you have some problems with the number of fish in the schools. All tetra need at least 6 of the same species of tetra around or they get stressed. I'm betting the fish is stressed from overcrowding, overstocking, and lack of buddies. Petco is having a dollar per gallon sale right now. I'd hurry over there and get a 20 or 30 gallon tank as your tetra and zebra danio should all be in groups of 6. That means 6 neons, 6 red phantoms, and 6 zebra danio.

Neon tetra like to be with their own type,try getting 3-5 or more.And yes it is overstocked.Your tetra maybe suffering swimbladder diseases.
Red phantom tetras will be suitable with only 5 of their species,i only have 4.
You need at least 6 danios in your tank.
Do you have a filter?
Do you give them water changes?

The kindness one does for an animal may not change the world........but,it will change the world for that one animal.Stop animal cruelty!!

i have very hard well water that i let sit for 5 days when i do a water change... i am planning to move to a 15 gallon when i have the money and time he seems to be doing fine after i feed them and he only really dose it when the light is on. he is like paralyzed by light

i have 9 bettas together, i dog named sunny, a few tetras, and a pond out my back door

Letting your hard water sit for a few days does nothing for the hardness; letting the water sit allows the chlorine (but not chloritamines) to evaporate. Hardness doesn't evaporate away. The only way to reduce the hardness is to dilute the water with pure water (RO or distilled).

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